FIXED PROSTHODONTICS ACTUAL FINALS
ANSWERS AND QUESTIONS SET A+
✔✔The most common impression consists of what steps? - ✔✔Retraction cord is
removed.
A light-bodied impression material is syringed around the prepared tooth.
Medium- or heavy-bodied material is loaded into a tray.
The loaded tray is inserted over light-bodied material.
When set, the tray is removed.
✔✔Final impression - ✔✔Contains the prepared tooth and adjacent teeth
✔✔Opposing impression or model - ✔✔Helps the lab develop an occlusion on the
prosthesis that is in harmony with the patient's occlusion
✔✔Bite registration - ✔✔Helps the lab determine how the two models occlude
✔✔Lab prescription - ✔✔Accurately describes what the dentist wants the lab personnel
to create from the enclosed impressions.
✔✔What is the most critical part of the tooth preparation? Why? - ✔✔The margin of the
preparation is the junction of prepared tooth and unprepared tooth. It is often under the
gingival margin and must be covered by the provisional restoration to prevent sensitivity
and decay.
✔✔The dentist has taken a single arch impression containing the prepared tooth. What
else will need to be performed for the lab to create a crown? - ✔✔An impression of the
opposing arch and a bite registration will need to be obtained for the lab.
✔✔What information must be included on the lab prescription? - ✔✔Be sure to include
the patient's name, gender, and age. If porcelain is indicated, provide the shade. Also
provide a return date for the case.
, ✔✔What three items are provided by the closed-mouth impression technique? - ✔✔The
closed mouth impression technique provides a final impression of the prepared tooth
and arch, an opposing arch impression, and a bite registration.
✔✔If you are using the two-cord technique for gingival retraction, when is each cord
removed? - ✔✔The larger cord is removed immediately before the impression; the
smaller cord is removed after the impression.
✔✔The prepared tooth (or teeth) requires protection while the lab creates the final
prosthesis. This one- to two-week period is enough time for: - ✔✔Bacteria to penetrate
the dentinal tubules and infect the pulp
Gingival tissue to hypertrophy (overgrow) the margins of the tooth preparation
Teeth to shift, causing the new crown not to fit
✔✔What's the sequence for creating a crown? - ✔✔Remove gutta percha for post.
Prepare post hole to size.
Try in post and cut to length.
Cement post.
Acid-etch tooth and apply adhesive.
Place composite resin core and cure.
Prepare tooth.
Place small retraction cord in sulcus.
Place large retraction cord in sulcus.
Fill impression syringe with light-bodied material.
Load tray with heavier material.
Obtain impression.
Remove small cord.
Make provisional crown and cement.
✔✔Gutta-percha - ✔✔Plastic type of filling material used in endodontics.
✔✔Which of the following steps in post and core fabrication comes first? - ✔✔Removal
of gutta percha with a peeso reamer
✔✔In the two-cord technique for gingival retraction, which of the following steps comes
last? - ✔✔Thin cord removed from sulcus
✔✔True or False: A core buildup is used when inadequate tooth structure remains to
serve as a foundation for the fixed prosthesis. - ✔✔True
✔✔Which of the following items is not sent to the lab? Why? - ✔✔Pre-preparation
alginate impression of tooth to be crowned
A pre-preparation alginate impression is taken to make fabricating a provisional crown
easier.
ANSWERS AND QUESTIONS SET A+
✔✔The most common impression consists of what steps? - ✔✔Retraction cord is
removed.
A light-bodied impression material is syringed around the prepared tooth.
Medium- or heavy-bodied material is loaded into a tray.
The loaded tray is inserted over light-bodied material.
When set, the tray is removed.
✔✔Final impression - ✔✔Contains the prepared tooth and adjacent teeth
✔✔Opposing impression or model - ✔✔Helps the lab develop an occlusion on the
prosthesis that is in harmony with the patient's occlusion
✔✔Bite registration - ✔✔Helps the lab determine how the two models occlude
✔✔Lab prescription - ✔✔Accurately describes what the dentist wants the lab personnel
to create from the enclosed impressions.
✔✔What is the most critical part of the tooth preparation? Why? - ✔✔The margin of the
preparation is the junction of prepared tooth and unprepared tooth. It is often under the
gingival margin and must be covered by the provisional restoration to prevent sensitivity
and decay.
✔✔The dentist has taken a single arch impression containing the prepared tooth. What
else will need to be performed for the lab to create a crown? - ✔✔An impression of the
opposing arch and a bite registration will need to be obtained for the lab.
✔✔What information must be included on the lab prescription? - ✔✔Be sure to include
the patient's name, gender, and age. If porcelain is indicated, provide the shade. Also
provide a return date for the case.
, ✔✔What three items are provided by the closed-mouth impression technique? - ✔✔The
closed mouth impression technique provides a final impression of the prepared tooth
and arch, an opposing arch impression, and a bite registration.
✔✔If you are using the two-cord technique for gingival retraction, when is each cord
removed? - ✔✔The larger cord is removed immediately before the impression; the
smaller cord is removed after the impression.
✔✔The prepared tooth (or teeth) requires protection while the lab creates the final
prosthesis. This one- to two-week period is enough time for: - ✔✔Bacteria to penetrate
the dentinal tubules and infect the pulp
Gingival tissue to hypertrophy (overgrow) the margins of the tooth preparation
Teeth to shift, causing the new crown not to fit
✔✔What's the sequence for creating a crown? - ✔✔Remove gutta percha for post.
Prepare post hole to size.
Try in post and cut to length.
Cement post.
Acid-etch tooth and apply adhesive.
Place composite resin core and cure.
Prepare tooth.
Place small retraction cord in sulcus.
Place large retraction cord in sulcus.
Fill impression syringe with light-bodied material.
Load tray with heavier material.
Obtain impression.
Remove small cord.
Make provisional crown and cement.
✔✔Gutta-percha - ✔✔Plastic type of filling material used in endodontics.
✔✔Which of the following steps in post and core fabrication comes first? - ✔✔Removal
of gutta percha with a peeso reamer
✔✔In the two-cord technique for gingival retraction, which of the following steps comes
last? - ✔✔Thin cord removed from sulcus
✔✔True or False: A core buildup is used when inadequate tooth structure remains to
serve as a foundation for the fixed prosthesis. - ✔✔True
✔✔Which of the following items is not sent to the lab? Why? - ✔✔Pre-preparation
alginate impression of tooth to be crowned
A pre-preparation alginate impression is taken to make fabricating a provisional crown
easier.
